Self-Organised Criticality: Difference between revisions

no edit summary
No edit summary
No edit summary
Line 6: Line 6:
This situation can only occur in systems that are ''not in equilibrium'', in which fluctuations provide a mechanism for regulating the system and keeping it close to criticality.  
This situation can only occur in systems that are ''not in equilibrium'', in which fluctuations provide a mechanism for regulating the system and keeping it close to criticality.  


In magnetically confined plasmas, this state is thought to be responsible for the global transport phenomena of ''profile consistency'', the ''Bohm scaling'' of confinement (in L-mode)
In magnetically confined plasmas, this state is thought to be responsible for the global transport phenomena of profile consistency, the Bohm scaling of confinement (in L-mode)
<ref>[http://dx.doi.org/10.1109/27.650902 B.A. Carreras, IEEE Trans. Plasma Science '''25''', 1281 (1997)]</ref>, and ''power degradation''. Profile consistency is the observation that profiles tend to have roughly the same shape, regardless of the power and location of the applied heating.
<ref>[http://dx.doi.org/10.1109/27.650902 B.A. Carreras, IEEE Trans. Plasma Science '''25''', 1281 (1997)]</ref>, and ''power degradation''. [[Profile consistency]] is the observation that profiles tend to have roughly the same shape, regardless of the power and location of the applied heating.
<ref>[http://dx.doi.org/10.1088/0741-3335/43/12A/325 F. Ryter et al., Plasma Phys. Control. Fusion '''43''', A323 (2001)]</ref>
<ref>[http://dx.doi.org/10.1088/0741-3335/43/12A/325 F. Ryter et al., Plasma Phys. Control. Fusion '''43''', A323 (2001)]</ref>
Power degradation shows up in global transport [[Scaling law|scaling laws]], and implies a sub-linear scaling of the plasma energy content with the injected power.
Power degradation shows up in global transport [[Scaling law|scaling laws]], and implies a sub-linear scaling of the plasma energy content with the injected power.